Can we keep bird in house or cage?

A lot of people say that its right to keep a bird inside house. My questions is even if you keep bird in house open without cage . Isn't it wrong? Because Birds fly, They have no limit over area or interest. They want to fly high . How can you keep them in house? house maybe best for a person to live not for birds. So please comment on that, How good is it to keep bird in cage or in house rather leave them to go wherever they want. Example of flowers , they look beautiful until they aren't plucked . Once you pluck them , their beauty become destroyed Please comment on it , Thanks